Abstract
This study aims to clarify the influence of gas generation on ignition delay during laser ignition of Boron/Potassium Nitrate (B/KNO3) mixture. Ignition experiments under both vertical and horizontal laser irradiation were conducted with a diode laser to irradiate a B/KNO3 sample, and ignition delay was measured. It was revealed from high-speed imaging that gas generation occurs prior to ignition and interferes with laser. The ignition delay with horizontal irradiation is smaller than vertical irradiation because the generated gas might attenuate the laser intensity. The numerical calculation was performed by solving transient thermal conduction with laser transmittance of 80-100% and showed agreement in the range with the transmittance.
